Author(s)

A. Rinaldini, A. Grillo & A. Marino

Abstract

This paper deals with local seismic amplification analysis in the industrial district of the Sulmona basin (Central Italy) using both Nakamura’s HVSR technique and 1-D numerical simulation computed with Shake91 code. An extensive geognostic database allows one to make out the geometries of the subsurface layers up to a depth of 50 m and cross-hole tests led to characterization of the dynamic proprieties of terrenes, namely the shear wave velocities values. Noise measurements were collected in the 0.1-10 Hz frequency domain and data were used to calibrate the 1-D simulations, performed using as source a seismic record of M=5.5. The results obtained point out that local site effects are present in the central and eastern parts of the basin. Moreover, the comparison between the 1-D simulation spectra and the spectra of project provided in the Italian norms enhances the fact that in these areas the expected response is underestimated in the increased frequency range of buildings. Keywords: geognostic investigations, dynamic properties, H/V spectral ratios, resonance frequencies, 1-D simulation, industrial activities. 1 Introduction Intramontane basins are a peculiar physiographic feature of the Apennine range in Central Italy. With flat extensions up to hundreds of km2, these endoreic structures of tectonic origin are characterized by a high seismicity and facilitate the development of important urban settlements and productive activities into the Apennine chain. In this paper are presented the results of background noise measurements and 1-D simulations performed in the area of Sulmona. The main goal was to assess

Keywords

geognostic investigations, dynamic properties, H/V spectral ratios, resonance frequencies, 1-D simulation, industrial activities.